Sal Mineo puts aside his Plato role from REBEL WITHOUT A CAUSE and is here cast as a young Indian brave from the Sioux tribe. He finds and tames a wild horse which he names Tonka, only to have it taken away by a vicious cousin who joyfully beats it. It is eventually sold to the cavalry,
where it is taken into the custody of Carey, a decent captain who tags the horse Comanche. To be near his horse, Mineo sneaks into the fort and is captured. When Carey learns why Mineo is there, he sets him free, recognizing their common love for the horse. Carey rides the horse into battle with
Custer against Sitting Bull's army and, along with every other cavalry member, gets kill...